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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe1921390b79f87286e791844d3ffca0aa066765345bf02994310aec55ad312' 
  AND token = 'Tmdy0P1LrKHvxPYBLKPpyYmDChMlZPE27yTD2IfOG5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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