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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89debfd4ff6aee5fa8bb93177d238544339fe1b53f614fc3bcc4815698019ff' 
  AND token = '2bD9bf2U3Zf/HnrP7rEy7VAh4l4Ht2u0d8rS54fuAq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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