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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0830a3465cb428caf70721d155fcc9a862b6060f10422f58bec2af97224a772c' 
  AND token = 'zhr6goCBWqrOGM/SsQR5qjWaY1ogwQ9yM4IjIRQ5u7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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