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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d3ad2c0dda4f6f0f904fd1bc5ab73f03e5abb39bd2724c480baec6dc54479c' 
  AND token = 'DCOijv/oqLukktqeGEPDl1cjDf7wW3A8/Vmq5Xx2ULU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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