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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6daf4ccce6313fd1b980a74dcc3a024a23fdbc81a0d7f61c2c58cb306cdf1dd6' 
  AND token = 'nV5d2yN2SjT1Hy6J3hyCLFv3u/JKi9QcvzhSu7bGnkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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