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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693b1276643dd61e2e481e241a95f0ca8ec28d6edafd83d797d0eb1760453eb5' 
  AND token = 'EJzY1kAhg8o+G7SqVfG4d0D7P6Sg+fhekfBSvnBojr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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