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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315683564816470d9cb2abae60a11486dac5ee499675c3e6594b0878d43b68b0' 
  AND token = 'Nx8mWx6GvV+nhcF3cyVebdY+h1tcaF4hjOYv3ex6sTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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