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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7bac2c599e2636d8730d1338aa470caa781c772e444d2b5514f5d48364fa7c' 
  AND token = 'dmoByHImuSd7nSwr84d4IFFsCoblJVoHO+HSo4j2CiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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