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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef1e586deb29a593d61688d247823988862d4ee17f4cf44ebbc9710c36bc60e' 
  AND token = 'hv+exK19hrc5QRIguiJLilhnS6Aqx+9WUN83PfCDKmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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