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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e4581e39a2eec90d25c1c7e51c454ce358565a75559a9ec9aca86fe3308e55' 
  AND token = 'J2uz6Wb4VmK5TxdPv+EEZFKCkEPB6BUk/m2racEVo5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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