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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22640c29ca91a821252afbe2278d2bd130f721bf05645ab9be69bd8bf8d9cba1' 
  AND token = 'xUFGmWCTFOrW0eBjT1tc3LQDGTKwQJEj2wRKH23mIxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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