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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d59e77b16f1642455c9801bfeb1f9af7f744c95f370b8b2af220394886a6f3' 
  AND token = 'wE/N6R1zEsrBpNWsel8szuMRqFACvl6iAADipJg6tjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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