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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768ffc2ca3d7613e93e5e120e1074236ec1f6e91847408d16f3d02e3ac348c9c' 
  AND token = 'tLaDWqtX50o9dbu42SVpA7KyfxjcU/htWkVINwd1lX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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