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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1477b11eec437c3951ba09bb9b88fafda3f3deb7d3baafbc2bd993f1159aa4cf' 
  AND token = 'TbWMSAu7hCaJZjrlNHHJ9fzveDNBgIeVlGnmMFZIm/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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