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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e4ef89ad8c4ddfbddb6092f86d1443f5744786225e672095e8a80ed96e7b48' 
  AND token = 'Cb1v3G1Lo9n222d6u9J0U5m6pjg+ZCNE1CcCCsqMKaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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