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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c35e0e38996d20a2a2eb9c9211a58c7acb4bf041859634c9af9cb43f3b15f8' 
  AND token = 'mhDWMo5cudTJ7VqTxL5WHIay4r78R/ExNfGn2MuJy38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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