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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc90e9032f06d3d713652a684049ff001d7cdfa6c26fa1164f2a60daefa42fc' 
  AND token = 'KhwrV6Et9R5682Od1IpIV76yBxMnaj5bGCiXnRDw0Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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