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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192c546cb65dd2fe01b657ecbc1662a50aea6004ae06f3371c35feae6c18ca7f' 
  AND token = 'ideL4R5Qxze9GW+V0gN2o39JvanRgMECgEHkZnb5qP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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