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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f968cb51958447f1921bb31c56a83c81b6999a55328b00d5ce527687869030ae' 
  AND token = 'QsGdISqU6JlLwyRKP2BWG765HAtLlijQ4jE2wg5e48k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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