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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f32f57340222720b853807868dc3a51ed68f4eb7c95813387623c6da0a47ece' 
  AND token = 'a+hGgkMMBBghvAfLTM8ED1+aA5i06hymQP4PncGUY+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00160

JSON explain

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