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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136d3fda0b24f98552f02752827c5a051022c719337640e7e0d790503ff4a176' 
  AND token = 'wkXNuqx4W8lxZShRn1vA6M1FwUivTAQBpZQgfXoSizw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}