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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dafbdd7a2701eed3fc6d10f587cdfd5cf594a54886b5b0e87686c6364e6d43e' 
  AND token = 'tEVXQknVns1hmHop2ZmFAdhkFTIhutElUa8PtN0XZXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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