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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6233a7a272793a2613a95ef1ca3c1d47480b3bb371aaf8342120faedd4e8c86d' 
  AND token = '6LdxgM5PO42Ho0w5F9qGBEwnHN2uiHTwawsz3Pi2ga8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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