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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44dd5f546d22c3fe86da749c132431361379b5c70ace12aadc97882c282f224c' 
  AND token = 'C30n0S2x0CCGbMSYvLosYs8Vd0r7C/ddwFxjcO4BaOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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