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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2938ecf885a6a99ca0f6ef3893470021dc5fd3176f3b646b96481d09394fbe' 
  AND token = '9f1P4TYqAI9Ao4rXU6x6u2gBT5xH0rjz/nu3qCdQ+3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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