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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d7b2cc9b3f349432fe2396f17a5cd2492c288e9b0c1cc7ebd9723e69f4bc71' 
  AND token = 'aRKqgIu7SIU1KoI7kj6vBIrOgJYuaGfi3BYMoaMn3XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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