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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88f03b997d8d4fda345e3c4a82cda4ab980fa9618ee9bc9ba6230826f1e4e30' 
  AND token = 'sC2IdHUdnEc6d4wCCSVVRrtmUJexJpTGMdUBWfxPWJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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