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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a573d24247424098c62e4333ea1bf1cb0d1732dc806ac35ee135465a8c6cf184' 
  AND token = 'Vf4xrtN+3s1stJWn0DSg+e8yFfChlcgpcGzvWywG978=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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