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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36c22ea73bb7e16816cb847768fde17dd2661c40bcbf9c0b0d370f15e367fcf' 
  AND token = '9xyjDbhOHbGb2ApcDjeevDQW7rTAWxShwP29cp/yscc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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