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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd847b781f88495ef6ebe9f7fc132dae8f2449128ff961ec647fef982010f831e' 
  AND token = '8ErO4c5rV3zYFsUO6VyKKcb+7joNVZmjqpLE561Dm/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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