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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ffb4b59335eca2a9cf3f6b3d40f338f342502d7c5fbb6ce9f4546108a2f84c' 
  AND token = 'wGP08VQTjxqv/ZOxg7aT2ryAKaRzSEbD7Lo5mAaU4M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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