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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70f648c4653e1188081e2b03f3fe4f49aa66ac4bffec407be098cc865e7ff32' 
  AND token = 'gks63XbrN6rRtnL39XPm2RJZE/I/RRqSHTyLSVWhC6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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