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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9fd25db24b0f1a18d1632d89d6367caf0832d2bb316ee65469a9dc79822359' 
  AND token = '0UOPbgZgT26K8eBR3togrJiaoZvX1+ZOdsDFL846P2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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