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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2663867e896e0b39f53ff4109d20af6076bb90ed4253549a37a72c99d051fd74' 
  AND token = 'xnOYk5/5tLNi5+UtnFHumkjw621OpIOGxp4Blk45mQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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