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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adcbe87e939e5b3f13a3d2dbec29131cd994034a1c08226439ae1b3aed09860b' 
  AND token = 'rqx0+exgkew0RKYHcEXBVYW+whcgR5FLX1k+jso1CxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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