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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb531fdbabeaac9af88140650e48de82ee99b2846649ae2675c741c4ccb1971' 
  AND token = 'Nn7I2+IMSo4ZUTt7iP2Smo93497akVBAnLsIZ/ffOv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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