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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23b379f1804682ab40454a0e303d4717cb86a84976e6303d90dd80a92404679' 
  AND token = '/XvN/DvPbgSghNLNJpAEXAabIknYk4vk1GWZNG5DZko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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