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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855c97cf622375baece0188832af4aeaec36b84e4c54d36b2e5b988dc4d4749e' 
  AND token = '8deAEUW6kTmIv/ihx3v4dQCpIGqyrJ4YA4MQuAIaFsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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