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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8204c0c98cd96d8031bd3f4a74b82c05fff224311970489ed1d7d4530c4f0e91' 
  AND token = '4aFPzXdwxZXsRt77HG3OnZxGg2ibiWIQtKDFYa/B1CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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