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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f84cd065ecd1343a7665fd9f89a35afeb1919a3247d27fbce75cba81435c73f' 
  AND token = 'oFKfmGd49C2R7L+NRUySqFEuxR6ca2Lr+7CljjgPDOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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