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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ba52e8d328cd8a4bfccfebc5b8cb666f9d513eb42241a48c104783e163c4d7' 
  AND token = 'suRb9wRnt24lyobg4HeI6Zn72E2YQ4MIux0bfBg0suQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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