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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0fce5f43daa15f3e37afafe5a0c0e8bc6ab02aeb46cb89ce1992c320569699' 
  AND token = 'CpjFJrJUIMDgKDNsWjAYa9uQNW9mv1FUwbIvMAn+S1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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