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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6679f5dce6d35979a6c4d26bda36e59297fd740e9e62fbc00f3ecfc90a2fe90' 
  AND token = 'AF3/ob2BZn3LyVaNv27kK61a1+RadXrdazEglB8e6c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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