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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c13687759c7779383febb37c74102f0d183da9db44c4d9f9f7b51688a63037b' 
  AND token = 'WQ5maH5pdbkyDsJJPUouDmoGwa0FGkDOTzNniORHNWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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