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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5c55bf8470dd4d9058ce79a058932ea3a41069b9e188661f59cf5220112f2f' 
  AND token = 'J1mLn0EHPRxYqN5xIKwUQ8fWqu0sJzo7Sy7lUHaNcns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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