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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d25fc114176e3cbf5a4ecbe73b47d71df91a3466c31a846bf94de5d76d7295' 
  AND token = 'lBP1B33HxMN4XbgdvShCkGqCSai/cZk3DfDW0d2H4B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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