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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6aab3855fb26c383b2df3f2d866e012a20dc8581071f33fa0dabf5ea24cee9d' 
  AND token = 'Scv6/Ldwy6ARsxHQ/lbkhFcRWBy++2I7nsO+o/DE3xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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