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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d335e6e1d3786cd43f96678d93607a5fb79daf0e74a8737a58ccb10986917a' 
  AND token = 'EHm28c1dpPVUiR+3fNBSEjRn/amYLyJ6n48dqu3zdfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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