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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5b79a76b8fd23f4551743ffa43fce057836b929232df677bfb61ec78b8bad7' 
  AND token = 'XEM/A1jDVdXi8b8tmBR3RbaHNxmxuIC88ZJqclNI6CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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