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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6810386db17ff7ad6eda280770f4c5d590c494dce5ef10fff85e094b6a08f35' 
  AND token = 'bTAcWR6ii9vef3+L9vAMipSe5kJXd1CkE3feZWoHsWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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