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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e4b3e3d3c3d7345a06df419e73d16e9c35cf2ec12c8f9047e1b66812735731' 
  AND token = 'qLLsZc3CzSnzCVjf1q3Z5T5YniDx0PMwa4LuOE1GfrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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