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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693c66e5285b52fbe18d19582f3ace76991d51d0129542ee56e06a3bf46acfb7' 
  AND token = 'l6pdf4yUzD5PeT3bOvsdgqzkBS6+RUwDMs5XCWnjc5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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