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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f94318be0ec357fd8acbe51c338a7ef7793f1d1482a14a09b2c377db8dfba7' 
  AND token = 'YLZgxuWGhFvr77o7fPc/Ka8Uuz/iljvcrdMbcO7EAcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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