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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3448909dad0bfc29037de9afe629fb7f277991f2dd542b5af12445cb6561f286' 
  AND token = 'Bof1982katMaSueacDo52ankoyj6iF8W9EkN0Sery9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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