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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80fa94ad76838c9201cb3bf6e38fe935ba498106c9ada5ddcaa09be03f97e2f' 
  AND token = 'DpNqS28I7UC35Um9wKT+t1KlXta7STfB6pbTjLCvodo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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