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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ab8808dd4d4910a5f5ecab2e9376d80b501293d7df9a227165488c9bf5ad27' 
  AND token = 'oPXa0nHrZq3DL74KylqrCoF/XSWsrCLYXC89GOGotww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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