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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1793dba1e4a01d1e6453186e7bccf0c2036ab4b77f8893c6ab6077d6ebdee3' 
  AND token = '3cXjHpU9flkR3KGRUODZT3dOwkb0w7MrXA4rP8EpcoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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