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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f9ce0f68f1bc9c02f9d8694dcdd8bfbc8c3ad5860fa6e1c7e4ea462598ce91' 
  AND token = 'gr7MBVPgMIFKeK15GuxY+chfyla7sxcKIyScSsRUZZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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