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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2a3489ae653ff0dc7817d1254b0f3b6e167c935ed0ab1a60c33571058f5963' 
  AND token = 'F9Y0hW5RWRXquUaSEEUYSj9NH1Ha1TPLPA3ye5a1h+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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