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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2eeff5f7e5ef46cbccdd8159699ec3c7cc794f7fe997f2991188a5794eab5f' 
  AND token = 'rKEf4ZIwK70yk4o9p+lC4JaXJlQI6TmOTN7VllFv5jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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