SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '750179f4f4334e80f099938ffa9a1dcd0272fd5d57ed542ca2fc6e30cbd6bb0f' 
  AND token = 'r/eKvYy/qPeAC8JQVkV/HGR5IhOTpj3dIER9XjlQxN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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