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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb173cb3cd48a4ad90e39dd1cb596a75a358fff31c766f2351cfdec44a3e4ea3' 
  AND token = 'iZpxgV8OIi09bp1B5Pt9UibrMru8AIYsOj03/cXeVCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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