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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08de28bc163a37a55d5dfbfd4c2019acdaa988f097acacf15d3d11defafa0d0' 
  AND token = 'ARuDtH9++btk6BiUNgCHz0A0bln1H4d6ohtay+2N/II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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