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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ae1b3f0ae2024a01690289158a920670cc7b987b9c4a8637a93f3fc14441c8' 
  AND token = 'erGP8iSo0nRCQAsOKN94UTjcO/sK1oOH/23eH+J6DEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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