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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1d7ddd30f8474f827d36977d0fc11303daab21ca9852a4d77c8cfa3c1761ae' 
  AND token = 'E8cvFm+dtV0xsurbee1LHrjjXRhD/VB6P9AhFBTEALg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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