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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988b132b29dfa884022a9d230c56f9403a6af465f8bdc8cea45c5906a23ba731' 
  AND token = 'DFGKO9v51fuds6PXojihI0vB3tTlWtlI15bZs2VRMig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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