SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa57ea0f2b1e87c5de4903831bdbbe119c78d4ea8093450970ac7c60302ef25' 
  AND token = 'YKgbbp8pqJvjK3SFesnKNB91lZr/OWjK76zETh/uS6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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