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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4202509c4d71a227c69a58b3746dc018f1222a5eda5df3a32e2d8029e1c71bac' 
  AND token = 'RjNAnKq6ZoPoDQLT4mu8WPbOXZX+Wpq//RLJUfAebRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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